\section{Standard EnergyPlus Units}\label{standard-energyplus-units}

EnergyPlus expects information in a single unit system (SI). This requires interface developers to convert user inputs from those preferred by architects and engineers into the standard metric units of EnergyPlus. EnergyPlus will not perform any units conversions and will not have any unit conversion routines.

ASCII with no spaces is used for abbreviations. Note that exponents appear without any indication of exponentiation: i.e., kg/m3 not kg/m\^{}3 or kg/m**3. Also note the use of dashes. We have W/m2-K not W/m2*K or W/(m2*K).

At the end we note the ``problem'' variables -- the inputs that have non-standard units. Inputs using these units will have to be changed and the code checked to see how the quantities are used internally.

\begin{longtable}[c]{p{1.59in}p{2.9in}p{1.5in}}
\caption{Standard EnergyPlus Units \label{table:standard-energyplus-units}} \tabularnewline
\toprule
Quantity & unit & abbreviation \tabularnewline
\midrule
\endfirsthead

\caption[]{Standard EnergyPlus Units} \tabularnewline
\toprule
Quantity & unit & abbreviation \tabularnewline
\midrule
\endhead

angular degrees & degree & deg \tabularnewline
Length & meter & m \tabularnewline
Area & square meter & m2 \tabularnewline
Volume & cubic meter & m3 \tabularnewline
Time & seconds & s \tabularnewline
Frequency & Hertz & Hz \tabularnewline
Temperature & Celsius & C \tabularnewline
absolute temperature & Kelvin & K \tabularnewline
temperature difference & Kelvin & deltaC \tabularnewline
speed & meters per second & m/s \tabularnewline
energy (or work) & Joules & J \tabularnewline
power & Watts & W \tabularnewline
mass & kilograms & kg \tabularnewline
force & Newton & N \tabularnewline
mass flow & kilograms per second & kg/s \tabularnewline
volume flow & cubic meters per second & m3/s \tabularnewline
pressure & Pascals & Pa \tabularnewline
pressure difference & Pascals & Pa \tabularnewline
specific enthalpy & Joules per kilogram & J/kg \tabularnewline
density & kilograms per cubic meter & kg/m3 \tabularnewline
heat flux & watts per square meter & W/m2 \tabularnewline
specific heat & ------- & J/kg-K \tabularnewline
conductivity & ------- & W/m-K \tabularnewline
diffusivity & ------- & m2/s \tabularnewline
heat transfer coefficient & ------- & W/m2-K \tabularnewline
R-value & ------- & m2-K/W \tabularnewline
heating or cooling capacity & Watts & W \tabularnewline
electric potential & volts & V \tabularnewline
electric current & Amperes & A \tabularnewline
illuminance & lux & lx \tabularnewline
luminous flux & lumen & lm \tabularnewline
luminous intensity & candelas & cd \tabularnewline
luminance & candelas per square meter & cd/m2 \tabularnewline
vapor diffusivity & meters squared per second & m2/s \tabularnewline
viscosity & ------- & kg/m-s \tabularnewline
dynamic Viscosity & ------- & N-s/m2 \tabularnewline
thermal gradient coeff for moisture capacity & ------- & kg/kg-K \tabularnewline
isothermal moisture capacity & ------- & m3/kg \tabularnewline
\bottomrule
\end{longtable}
